I have a problem with my current setup. I have an aquarium of about 40 litres. I have an internal filter that only have a sponge. Now the problem is that the water is always yellowish and the sponge clogs tooooo much. I do water changes of about twice a week and every week i need to wash the sponge in the same water that i had just removed from the aquarium. I house around 30-40 fish that are being raised. I have some swordtails and guppies. How could i arrange the problem. Lately i had around 15 small fry of around 1 month old and found them all dead
Now how can i arrange the colour of the water?
Nitrate is at 1. How can i arrange this?
I have a small reading lamp as a source of light. Do i need to change this?
Why does the sponge clogs so quickly?
Thanks in advance